Study on Dynamic Characteristics and Failure Mechanism of Wet Dual Clutch Transmission

Abstract:

The failure of a 6-speed wet dual clutch transmission is analyzed， and it is found that the fracture of resin slider in torsional shock absorber is the main reason for the vehicle losing power. In order to analyze the failure condition and failure mechanism， vehicle starting and full throttle acceleration tests were carried out. It was found that the maximum impact moment of the torsional shock absorber was 928N·m when the engine temperature was -2~5℃， and most of the maximum impact moment occurred in gear shifting and full throttle acceleration in low gear condition. To explore the failure mechanism， a torsional vibration mechanical model of drive system was established， and the inherent characteristics were analyzed. The results show that the second natural frequency （11.51Hz） of the first gear unengaged state of the system is close to the peak frequency （8-13Hz） of the starting condition in the test， and the resonance slider is easy to be damaged. The results show that the large instantaneous impact mo ment and the system resonance during the starting process are the main reasons for the fatigue failure of the slider.

Key words:wet dual clutch transmission;dynamic characteristics;failure mechanism;twisting vibration;system resonance